I am seeing behavior different to what you describe. I have a WMS layer providing data over Australia (using tilecache.py) and if I set it up to have no BBOX restriction set on the TileCache, then transparent tiles are requested and provided when my map viewport is showing other parts of the world (e.g. zoomed in on Africa).
However, if I set a BBOX restriction on my TileCache and also set the same as a maxExtent on the WMS layer, then I get pink tiles displayed over Africa when I zoom in there, while my actual data tiles display over Australia when it is in the viewport. I was expecting to have no tiles requested when zoomed on Africa with the maxExtent of my WMS set to Australia. Something must be wrong. I've checked my settings a few times now, but being fairly new to OpenLayers I wonder what I might be missing. Can anyone else test this and confirm that this does/doesn't work? Ta, Steve Andreas Hocevar-2 wrote: > > Eric Lemoine wrote: >> On Monday, November 23, 2009, Andreas Hocevar <ahoce...@opengeo.org> >> wrote: >> >>> Hi, >>> >>> srweal wrote: >>> >>>> Actually, to simplify this question a bit, can someone please just >>>> explain >>>> how the setting for mapExtents on a Layer, as opposed to setting >>>> mapExtents >>>> on the Map differ? >>>> >>>> >>> The maxExtent of the active base layer takes precedence over the >>> maxExtent of the map. For overlays, maxExtent is only used to determine >>> if the layer is to be displayed or not, i.e. if it would be visible in >>> the current viewport. >>> >> >> are you sure about that Andreas? I thought only minResolution and >> maxResolution were looked at to determine whether an overlay is to be >> displayed. I may be wrong, and would appreciate being corrected and >> pointed to the relevant code in that case. Thanks, >> > > You are right, calculateInRange (which turns layer visibility on and > off) only uses min/maxResolution. OpenLayers.Tile::draw determines tiles > to be loaded by checking interectsBounds of the viewport with the layers > maxExtent. > > Regards, > Andreas. > > -- > Andreas Hocevar > OpenGeo - http://opengeo.org/ > Expert service straight from the developers. > > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users > > -- View this message in context: http://n2.nabble.com/mapExtents-for-Layer-vs-mapExtents-for-Map-tp4036288p4049707.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users